package Text5;

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    static int[] arr = new int[200010];
    static long[] dp = new long[200010];
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n=in.nextInt();
        for (int i = 1; i <= n; i++) {
            arr[i]=in.nextInt();
        }
        long res=Integer.MIN_VALUE;
        for (int i = 1; i <= n; i++) {
            dp[i]=Math.max(dp[i-1]+arr[i],arr[i]);
            res=Math.max(dp[i],res);
        }
        System.out.println(res);
    }
}